more: use single exit path to ensure resource freeing is unified

more: use single exit path to ensure resource freeing is unified

And be a little more complete all the allocations that can be released are,
but there is a small catch.  As mentioned in ncurses FAQ some leaks are
intentional, and that's the way they are.

Reference: https://invisible-island.net/ncurses/ncurses.faq.html#config_leaks
Reference: http://man7.org/linux/man-pages/man3/_nc_free_tinfo.3x.html
Signed-off-by: Sami Kerola <kerolasa@iki.fi>